Silicon Labs 10kV Surge Protection

Sometimes environments can get really rough. For example, where voltage surges can reach 10kV and high value products must be protected. Helping to mitigate these effects is the Si86xxT Family of digital isolators from Silicon Labs that are rated to 10kV surge protection.

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The Si86xxxT is a family of multi-channel digital isolators that are based on the proprietary capacitive isolation technology that enables low propagation delay and skew, low emissions, high noise immunity and high reliability and long lifetime. The Si86xxxT family has products ranging from dual channel to quad channel in wide body packages to accommodate the higher isolation rating associated with these products. The high-voltage isolation barrier has been enhanced to withstand 10 kV surge hits safely. Family highlights include:

10 kV surge capability, VDE 0884-10 reinforced rating
Fastest and most accurate timing specs – low propagation delay (10 ns) and low skew (1 ns)
Highest noise immunity (CMTI) of 100 kV/µs, and lowest electro-magnetic (EM) noise emissions (20 dB lower than ADI products)
Long lifetimes under high voltage conditions – 100 years at 1000 V

Ideally suited for harsh applications such as:

Solar Inverters
Outdoor equipment such as base stations
Motor Control and Drives
Metering
Automotive

The following table summarizes the key advantages:

Customer or Market Need	Product Feature	Benefit
Secondary lightning protection	10 kV surge withstand capability (This feature was not previously available with Si86xx isolators)	Secondary lightning protection
Fast and accurate timing budgets	Low propagation delay of 10 ns and low skew of 1ns	Increases system efficiency and/or effectiveness
High noise immunity and low emissions	High noise immunity of 100 kV/µs and 20 dB lower emissions compared to other digital isolators (Noise immunity of 100 kV/µs was not previously available with Si8xxx isolators)	Increases system effectiveness, safety and reliability by preventing external noise from disrupting system
Long lifetimes under high voltage bias	SiO2 based isolation barrier provides 100 year lifetimes at 1000 V	Prolongs system lifetime and ensures safety

The family consists of 20 variations based on channel count ( 1, 2 , 3 or 4 forward; 0, 1 or 2 reverse), package style and output default state.

The Si864xxT EVB allows designers to quickly evaluate capabilities and functionality, either by driving inputs to logic high or low, or injecting signals to the header pins via single wires or a 2 x 6 ribbon cable.

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